198639250 has 16 divisors (see below), whose sum is σ = 371853144. Its totient is φ = 79455600.

The previous prime is 198639239. The next prime is 198639263. The reversal of 198639250 is 52936891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 128799801 + 69839449 = 11349^2 + 8357^2 .

It is a junction number, because it is equal to n+sod(n) for n = 198639197 and 198639206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397029 + ... + 397528.

Almost surely, 2^198639250 is an apocalyptic number.

198639250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198639250 is a deficient number, since it is larger than the sum of its proper divisors (173213894).

198639250 is an equidigital number, since it uses as much as digits as its factorization.

198639250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794574 (or 794564 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 198639250 is about 14093.9437348104. The cubic root of 198639250 is about 583.4742426034.

The spelling of 198639250 in words is "one hundred ninety-eight million, six hundred thirty-nine thousand, two hundred fifty".